JPS5854414A - Countermeasure system for voltage variation - Google Patents

Abstract

PURPOSE:To save an idle capacity equipment in an electric power system having an automatic voltage regulator by utilizing the regulator for improving the power-factor of the whole load at the time of steady operation. CONSTITUTION:When a regular load 4 is applied, an automatic power-factor adjusting device 8 for improving the power-factor of the general load 4 is actuated by a CT 14a for detecting the whole load current of a system to be detected and a PT15 for detecting voltage, offsetting invalid electric power. In case of starting an induction motor, a capacitor in the automatic power-factor adjusting device 8 presently utilized for improving the power-factor of the general load 4 is forcedly turned off before the starting of the motor 6 and the whole capacitance of the capacitor is waited in order to start the motor 6. An AVR3 operates so as to compensate the voltage drop of a line impedance 2 for the invalid electric power of the general load 4 adjusting an electric power receiving point A at a prescribed voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is an automatic voltage adjustment device I (hereinafter referred to as A
The present invention is intended to provide a countermeasure system for suppressing fluctuations caused by loads that are accompanied by large tidal changes at the time of starting and stopping in a power system having a V (referred to as V).

Conventionally, there was a system shown in Figure 41 as a Jin no Kiwami system. In the figure, (υ is the infinite bus line that is separated by wlL of the power system, ψJ is the i1!111 impedance to the receiving point ^, (3J is AVlk that compensates for the voltage drop in the Uoshin system that is NIL, and (4) is General negative m, (6J is general negative (ill switch for turning on 47), (6J is iI which enjoys a big improvement in temperature range at the beginning of 1I11!! 4 tortoise axis, (7) is 11 fathom Tortoise motor (@2 switch for turning on the power factor, (from August, the power factor of the capacitor equipment for the rate change l# is automatically adjusted to 1III!! Tortoise, (9) ~ - is the power factor/self # 11
11 & * (aJ & configuration f!it1M"c',
(9741) Lance, IQ is a series reactor, (b)
is a capacitor.

The ring is a rear acrylic ■, the thyristor switch for connecting the capacitor 4 to the system, and the ol is the ll1 circuit for adjusting the capacitor @ noodles necessary for power factor improvement.

- is the total load current of the target load system al! CT to be issued,
Ql is an FT that detects the receiving voltage of the target load system.

Note that the power factor day shift -11 device (a group of 13 yen capacitors is installed by dividing it into two banks, with the Tosho QQ NH circuit as one bank).

Next, the operation will be explained. The power of the infinite bus (17) is supplied to the receiving point A via l5w1I, which has an impedance (2), and AVII, which guarantees the voltage drop at the receiving point ^ due to the load voltage.

Let's now turn on the power switch and supply power to 43 to take the #i effect of the power factor. Then,
! I load 11ttIIL extraction CT- and voltage detection FT of power receiving point ^ (load wt accent and voltage are extracted by ill, n,
The signal is sent to the power factor adjusting part @ IE (a) - once to the trout, resulting in a negative '4! The capacity of the capacitor to make the power factor approximately 100% is determined from the magnitude of the current and the phase difference between the load telephone and the voltage, and correspondingly, the required puncture of the thyristor switch is set to ONg (L , the capacitor hook is inserted into the self & 1fPJ.The leading reactive power is taken by the inserted capacitor, and the power factor of the negative power factor of the n pair group is close to Zoo 9b (and the continuous rotation is 8rL,
Efficient load operation is essential.

In addition, the 1JIA path impedance (phantom voltage drop due to the effective component is compensated by AVR (83).

Next, close the switch (7) and close the S-guide WIL#IIJ machine (6
). General load (same as seasonal, it is a load with continuous location rate).

In this case, unlike general negative direction (4), start II! The period of 1 hour and 10 seconds is accompanied by a change in tide that is several times larger than that during the constant voltage iN transition. By the way, the power factor is slow n, PF■0.2~0
．． Since there are 4 barks, most of the inflow energy will be occupied by reactive power. Scold tζkasa t! The more the load of ws threat movement 5Ita> on ILa becomes larger, the more the voltage fluctuation due to sorL becomes false fiL#i.
The impact it has on people is increasing. For the rE turtle-like turtle pressure perturbation, the AVR of the system (bm can be done with aJ, but as stated in R < m !From the Dankai of gE speed,
It is impossible to absorb voltage fluctuations due to this.

Therefore, since reactive power accounts for most of the voltage fluctuations,
For the purpose of absorbing reactive power by changing the power factor when the general negative 4t-
(a) is used to suppress voltage fluctuations during starting. Fortunately, the input switch of the self-control power factor lI411i mosquito holder (1) is a tortoise 5KB9 switch based on thyristor switch 4, so it can quickly respond to tortoise pressure lacrimation, so the purpose can be easily changed.

Next, the self-power factor #WiIIk iris (8) is Ichiban Kame Kanrei (
6) enters the constant 7i filtration state - then the invalid force becomes Ka n power factor PF
-0,8t1. In order to improve H, the ratio of the capacitor 'all' and the general negative d1 (leaving only 11 volts of aJ).

This will wait for the next mmi conversion. In total, the tortoise pressure is compensated for the tortoise pressure that flows into the load by the 6 ant speed ^vst (a) e. Since the shrub system was 50 m/month as described above, the crab I$ Auto-equipment C.)'s b irises, i.e. capacitor Q
■ 1 凰 needed to be equipped with a general negative @ < seasonal power factor improvement and a combination of Ronjin turtle #- (Shun's m1ll + time trend useless part. Motion 11IA (for the 63rd minute, it is related to the stiff mc change that is like a sudden fibrillation and no restraint, and when it enters the There was a large fish that became thin and thin, and was placed in a bowl.

As a hook with ξ, the length of 1 mk long wax in the conventional system (
2 of each part in 1 stone 1 figure of the capacitor Makiya Iris required in season
Set Elk and perform one nose as shown below.
Shun's Power Endangered Stone Capacitor Tani Raku Shun Tani Fit 100O
KVA, PF 0.9 (fil'L), Jl
, S1G00X 59th-s 485 [avA+
-------------(17ΦhLu mjl16Th(Power of the phrase Contensor valley hTE Kame time 800KW, Power factor ry-o, a (1lin) Starting % 2100KV
A, power factor PF-OJ6 (afi) 1) Power of starting shaft ◆Improved fine tensioner (for electric ratio fluctuation xivit) tloox σ1F-21ooxu,e? s g
o as txvar -・------<2) constant N
From the calculation results of ■, when the power factor is changed over the cold temperature setting, the power factor self-excitation is S* & the capacitor setting is.

Formula (1)+tgj-486+20811-2468
(KV)L) ・−・−・−・・・ (4)
So, when Ohiroki II/14III enters steady operation, the formula ttJ4 (3J" aaa + 225 m 660
(xva) ・-・・-・-(63, so equipment@breath formula (4J-(5J11808 (Kva)
=-L6J as a whole becomes unnecessary during that time.

Before I think about it, I also calculated the voltage fluctuation at the time of starting the first electric motor.

Linear impedance Z-7O+jl! GO%(atlO
MVA).

- Conductive wJJ When starting the valley, divide the irises into effective and inactive parts.

U-100 (KV, A) -g100XOJ5+ j! ! 100x F stone π-stain 6g
s+ jli108B, so the formula for calculating the 11IL pressure vibration rate is % formula % (7) As can be seen from the calculation formula (7), the effective component is 8.74
40.7% was due to the reactive force, and it can be concluded that the voltage fluctuation at the time of starting is mostly due to the reactive force. Therefore, removing the reactive power at the time of startup is the most important point in countering the problem of torque change.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. The valley of the capacitor of the power factor self-plow type SNIIM used for improving the power factor was designed as a countermeasure against the tortoise pressure that accompanies the tide @ improvement Iζ, and when it enters steady operation, the full load power is reduced. The purpose of this is to provide a system that can reduce the amount of idle capacitor equipment by operating it to improve efficiency.゛・ The following is a part of this invention? We will discuss il and II2 eclipses. In II&211, (1)-(2), (to)
is the same as the conventional example, (14m) is also the conventional CT
CT same as Q41.

(14) is for detecting the negative flow flowing to the 1st lead wIL#JJ machine (6). (
1ill#1g1w1 with the signal 14b) added. However, the capacity of the capacitor of the automatic power factor adjustment device (8) is the reactive power of 4IllE at the time of starting the rice cake (6)?
It is equipped only for lagA.

In a system configured as above, the general negative @
(When 47 is turned on, a CT (14m) detects the full load current of the target system and one unit detects the voltage. Yu 1l
IIllIWiIigame (8) operates and the reactive power is canceled out.

First, when starting the b''Jinki 1III machine (6), first, before starting Forcibly set the capacitor to OIF L/ and put the capacitor on standby at the moment of starting the induction-wJ machine (6).At the same time, set the AVR (37 to the invalid torque of the first load (4)). The force component 1ζ operates in such a way that the voltage of the impedance 3 is below em.

After the operation is completed, the M4 tortoise mechanism (6) is activated by turning on the switch (7). Then, Sahiro Il! c&L
The starting current of machine J (6) is CT (14 n, t
INIIUT 8 t'L to lJ weight circuit. that time@
It is assumed that the load current input signal of the 11th step wheel is switched from the CT (14) side to the CT (t4b) @ within the control circuit, so the load current input signal of the general load (4) is There are no nine people. The capacitor input of the Toutei self-plow adjustment device 181 is performed by the conventional example and the operation of 14! swIL motive (At the time of start-up, a capacitor of all parts is introduced to suppress and slow down the tortoise pressure.

When the induction 1 motor (+3) moves to steady operation a few minutes after the first energization, the capacitor is reduced according to the inactive portion at that time. In addition, AVR (3) also compensates for the railway inbegun (February Koyoru &:, teacher) due to its negative wL style.

Next, when the steady operation of the induction turtle (6) is completed.

11JII 11th mo: i's negative number a no input 4W'S!
ICT (14b) #) 6CT (14m) and 6CT (14m) are cut off, and -mmta> is disabled.

ξ Here is the capacitor equipment that is essential for ξ's invention system @
The tumor is compared with the conventional example using the calculated values performed in the conventional example.

In the conventional equipment @Kame, the calculation formula (4) is 1488 (xva), which is the sum of the general load and the motor starting time, but in the invention of B, the general load is included in the motor starting time. Therefore, calculation formula (2) is used! This means that only 0118 (KVA) equipment is required. 4116 (K, VA) i
I1w&.

-Comparing the idle equipment capacity when Tortoise IElIk enters steady operation-, the conventional example is 1808 in calculation formula (6).
In the invention of CXV Genjin, the % calculation formula (!I - (13 - (3
) from 20g8-485-! ! ! 5 #18711
(XVA), 874 or 6 /i of the equipment @ part
It can be improved to F: It becomes jin.

In the above 'W1', if the general load approaches the value at the time of starting the motor, the standby part of the motor during steady state, that is, the idle part at that time, will be greatly reduced, resulting in a power factor with good efficiency for one flight. Self II
The equipment capacity of IIIl equipment is “Otori”.

As described above, according to Jin's invention, ^vm can be adjusted by sufficiently coordinating the power factor self-excited 111111ml device (8) with the power factor self-exciting device (8). , the capacity of the capacitor equipment can be reduced by only the inactive part of the general load. This has the effect of eliminating the voltage fluctuation countermeasure system.

[Brief explanation of the drawing]

Pictures 1 and 3 are Enyu diagrams showing the conventional tortoise pressure skin reaction countermeasure system;
The 1 m2 diagram is a schematic diagram showing a voltage fluctuation countermeasure system according to an embodiment of the present invention. In the figure, (υ is the infinite mother M1. (!J is 1iIII
11 impedance, (3) is self 1ElI voltage 111m
Device (AVR), (4) Bar! IL 萄, (5
The moon is a switch, (6) is a single conductor, (7) is a switch, (8) is a force◆self-excited regulator, (September is a transformer. Qt) is 7 volts in series, 4 is a capacitor, and Qa is Thyristor switch, Ql @ groan circuit, (14aX14
tl) is CT and Ql is FT. Incidentally, the same or similar symbols indicate the same or equivalent parts. Representative Shima Kyushu - Figure 1 SC; π bar 4 Figure 2 st: n bar> 7 Procedural amendment (voluntary) 1. V Fraud Agency Director-General 1, Incident Display Patent Application Sho 5ft-1528289
3. Person making the amendment 6. Detailed explanation of the invention in the specification subject to amendment 6. Contents of the amendment (1) In the 16th line of page 6 of the specification, the term ``load current'' has been changed to ``effective current. (2) On page 6, lines 11 and 16, the words ``from (delay)'' should be corrected to ``as (delay)''. (3) In the second line of page 8, ``8.7 + 40.7 J'' is corrected to ``8.7 + 40.7 C%''. (4) Insert the following sentence between the second and eighth lines of page 8. ``Here, R: resistance of the line, x: line actance'' (5) In the 6th line of page 10 of the same book, change the phrase ``because'' to ``
(6) On page 10, line 7 of the same page, the phrase "no inflow" is corrected to "not detected." (7) On page 11, line 18, “AvR” was replaced with “
``AvR'' ◎ That's all.

Claims (1)

[Claims] (A power system with an IJ automatic specific pressure adjustment of 1l11 lit), including loads that cause severe voltage fluctuations when starting and stopping a large amount of load equipment connected to this system. In the circuit, the power factor storage capacitor is stored by the IIIIIIJ@ path that inputs the signals from the current transformer for detecting and outputting the full load current of the target load system and the voltage transformer for detecting the receiving voltage of this system. An automatic power factor adjustment device that adjusts the amount of liI!11 and #i that detects the 11i current of the load that causes the voltage fluctuation.
A second variable current transformer is provided, and when the load that suppresses the voltage fluctuation is started or stopped, the control line of the automatic power factor adjustment device is supplied with the signal from the first current transformer in place of the signal from the first current transformer. Input the signal from the current transformer 2 and measure the valley of the power factor correction capacitor @-
The turtle pressure Hengai Taisho system that was made to do so. When starting or stopping the load, pressure fluctuations occur. 2. The voltage fluctuation countermeasure system according to claim 1, wherein the automatic voltage II4 voltage adjustment operates to compensate for a voltage drop in line impedance with respect to a general load motionless torque component.